Teleconnections in the Source-to-Sink System John Swenson Department of Geological Sciences University of Minnesota Duluth THANKS : Chris Paola, Tetsuji.

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Presentation on theme: "Teleconnections in the Source-to-Sink System John Swenson Department of Geological Sciences University of Minnesota Duluth THANKS : Chris Paola, Tetsuji."— Presentation transcript:

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Teleconnections in the Source-to-Sink System John Swenson Department of Geological Sciences University of Minnesota Duluth THANKS : Chris Paola, Tetsuji Muto, and Lincoln Pratson

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Teleconnections: Context La Nina anomalous SL pressure Strong statistical relationship between ‘weather’ in different parts of the globe Information propagates through the atmosphere Long-distance propagation of allogenic forcing (e.g. sea level change) through the transport system via erosion and deposition on geologic time scales

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Talk = theory & experiments Theory developed for geologic time scales, where forcing data are poorly constrained / non-existent  average over many ‘events’  implicitly involves the ‘upscaling’ problem Teleconnections in S2S fundamentally involve coupling of environments Cannot overemphasize the need to treat morphodynamics of the transport environments and the coupling of environments with equivalent levels of sophistication* *Requires considerable simplification of transport relations… A few important points (and a plea for forgiveness…)

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Morphodynamic models hint at long-term teleconnections in the S2S system: Alluvial aggradation during R sl fall can be long lived Eustasy can affect the entire alluvial system Fluviodeltaic systems behave as low-pass filters to both upstream and downstream forcing Wave energy can effectively suppress avulsion on appropriate spatiotemporal scales How do we test predictions in natural systems? Conclusions